A duplicate name has been detected on the TCP network. The IP address of the machine that sent the message is in the data. Use nbtstat -n in a command window to see which name is in the conflict state.

Yes, as W Bold says you con't have nultiple NICs on one subnet without this error, if your NICs and Switch are capable of it you can team the NICs, then they will only have one IP between the two NICs, no more error. If the NICs are not capable of teaming, then you will need to disable one or put it on another subnet.